defence fire and discharge smoke 防火排烟
smoke discharge 排烟
oil smoke discharge 油烟排放
smoke-discharge system 烟气系统
smoke discharge system 烟气排放系统
Discharge clouds of smoke 排出滚滚浓烟
ventilation and smoke discharge 通风排烟
smoke dust discharge concentration 烟尘排放浓度
smoke protection and discharge 防排烟
ventilation and smoke discharge equipment 通风排烟设施
Factories chimneys discharge smoke into the atmosphere.
一股黑烟从烟囱中冒出。
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Factory chimneys discharge smoke into the atmosphere make it dirty.
工厂的烟囱往空气里排烟，造成大气污染。
Factory chimneys discharge smoke into the atmosphere and make it dirty.
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